When national & local buyers design print creatives, it is important for them to know your print dimensions. We use this information to automatically size ads - making it easier for you to fill in information about the collection (and easier to make money!)
First, within your media kit, navigate to the collection you want to update.
Click on the gear icon next to the collection's name.
Within the window that pops up, scroll to the bottom and enter in the dimensions in the boxes as seen in the image below!
Remember to click "apply" & "save".